[FFmpeg-devel] [RFC] VOB files concatenation

[Michael Niedermayer]

On Sun, Jan 22, 2012 at 12:23:19AM +0100, Stefano Sabatini wrote:
> Hi all,
> 
> I'm currently dealing with VOB concatenation issues, since it's new a
> field for me (and it may unveil some bugs in FFmpeg) I'm posting it
> here.
> 
> After some experimentation:
> $ cat FILE1.VOB FILE2.VOB ... FILEN.VOB > ALL.VOB
> 
> results in a file which is playable by ffplay, with apparently perfect
> A/V sync.
> 
> If I try to remux such a file I usually got serious A/V desync, like
> in:
> $ ffmpeg -i ALL.VOB -codec:v copy -codec:a copy -f mpeg ALL.REMUX.PS
> 
> Very old ffmpeg-user discussion (2005):
> http://thread.gmane.org/gmane.comp.video.ffmpeg.user/1063/
> 
> where it is stated that physical concatenation with VOB files doesn't
> work well with ffmpeg, and alternative tools are suggested (mplayer,
> projectx, transcode).
> 
> If I'm not wrong a VOB file is nothing else that an MPEG-PS file with
> a funny name, and is one of the few formats which supports physical
> concatenation, at least according to our FAQ:
> http://ffmpeg.org/faq.html#toc-How-can-I-join-video-files_003f
> 
> but the physical concatenation+remux trick which I showed above
> doesn't seem to work well.
> 
> Do you have any advice? Is the mentioned trick supposed to work or
> there are some special considerations which make the MPEG-PS format
> unsuitable for such treatment?

id try it with some older releases to make sure its not a regerssion
if it is bisect would be interresting

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many that live deserve death. And some that die deserve life. Can you give
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even the very wise cannot see all ends. -- Gandalf
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